Fix completion strategy killing other pty's

Only a problem in synchronous mode

spec/integrations/client_zpty_spec.rb

@@ -1,10 +1,23 @@
 describe 'a running zpty command' do
   let(:before_sourcing) { -> { session.run_command('zmodload zsh/zpty && zpty -b kitty cat') } }
 
-  it 'is not affected by running zsh-autosuggestions' do
-    sleep 1 # Give a little time for precmd hooks to run
-    session.run_command('zpty -t kitty; echo $?')
+  context 'when sourcing the plugin' do
+    it 'is not affected' do
+      sleep 1 # Give a little time for precmd hooks to run
+      session.run_command('zpty -t kitty; echo $?')
 
-    wait_for { session.content }.to end_with("\n0")
+      wait_for { session.content }.to end_with("\n0")
+    end
+  end
+
+  context 'when using `completion` strategy' do
+    let(:options) { ["ZSH_AUTOSUGGEST_STRATEGY=completion"] }
+
+    it 'is not affected' do
+      session.send_keys('a').send_keys('C-h')
+      session.run_command('zpty -t kitty; echo $?')
+
+      wait_for { session.content }.to end_with("\n0")
+    end
   end
 end